How do I make a counter revert to a previous value?

Hey everyone. I'm making a game for one of my classes and I have a points system where you collect things from one layout and they carry on into the next. I figured that part out, but I'm having trouble making the points revert to the level 1 value after the player dies. For example, if the player had 80 points in level 1 and moved on to level 2 and got 20 more points but died, I want the points to go back to 80 (or however many they collected.) Currently, it either goes to 0 or to a negative number. My global variable is set to 0, and 20 gets added each time they collect something. I'm wondering if my code is incorrect.

Shouldn't it be set player score to level 2 starting score? Depends on your game design but from what you described I assume the start of level 2 is the score from level 1. There are many ways to do it. You can store the score at the end of level 1 as a total level 1 score and set your score to this if you die in level 2.